Process for the manufacture of pulp for paper, cardboard, artificial leather, and the like from peat



UNETE? STATEfi fPATENT,GFFECE.)

ADOLPH LIONEL BURLIN, OF CHORLTON ON MEDLOCK, MANCHESTER, ENGIIILAND- rnocn'ss non THE MANUFACTURE or PULP roRrArEa, CARDBOARD, ARTIFICIAL LEATHER, AND THE LIKE FROM rna'r. o

1T0 Drawing. Application filed July 30,

T 0 all 10 l mit it may concern:

Be it known that I, AnoLrH- LIONEL BUR- LIN, of 36 High Street, Chorlton on Medlock, Manchester, county of Lancaster, England, a subject of the King of Great Britain and Ireland, have invented certain new and use ful Processes for the Manufacture of Pulp for Paper, Cardboard, Artificial Leather, and the like from Peat, for which I have filed an application in Great Britain Apr. 26, 1920, #111,458, and of which the following is a specification.

This invention relates'to'the manufacture of pulp for making paper and the like and has for its object a process whereby pulp adapted for the manufacture of snow white paper is manufactured from freshly dug peat.

Owing to the variable conditions of the fibrous peat used in this process, it is necessary to divide the process in two-distinct operations, the first one deals with the strong fibrous peat and the second with the finer fibrous peat. Bleaching is or maybe also carried out as a separate operation.

1. Strong fibrous peat.

The freshly -dug peat (which contains about of water) is thrown on a dressing table and all the thick roots and foreign bodies it may contain are separated by hand. The peat is afterwards placed in a boiler, preferably made of cast iron, provided with a perforated false bottom at about 6 inches above the" bottom of the boiler,,and with a movable wooden cover so that a loose stirrer can be inserted occasionally and put in operation.

A solution of caustic soda from 1.50% to 2% according to the lightness or-darkness of the peat treated (the lighter the peat the weaker the solution) is then added in sufficient quantity to cover the peat in the boiler, and the contents are boiled and occasionally stirred for about two hours.

At the end of this period the following test is advisable: a small sample of the peat it taken out of the boiler, washed in cold water, and placed in a test tube and a small quantity of fresh caustic soda solution (of the same strength as has been added to the peat in the boiler) is poured over this sample and well shaken and the whole is filtered. If the liquid (filtrate) is of a light brownish colour the boiling can be Specification of Letters Patent. Panted 1922 1920. Serial No. 400,047. 2

considered as completed, if-the said filtrate is dark brown, the boiling should be "continued and the test repeated at intervals until a filtrate of the desired colour is'obtained. V 1 After boiling, the whole pulpy massis'run into a large tank, washed withcold water and the water is drained off, either in the same oraseparate tank and a 2% solution of chloride of lime is poured over the mass in sufficient quantity to cover it.

After. about half an houra small quantity of an aqueous solution of bicarbonate of soda is added, the mass is well stirred, washed and acidified with a very dilutesolution of any acid, preferably sulphuric acid; it is then washed with cold water until'perfectly neutral. The material is then run into a filter press and-made into cakes. These cakes, which still contain from 30%to 4.0% of water are ready to be treated'in apaper mill for the manufacture of light brown paper, cardboard, artificial leather and the like which can be dyed any colour except white as it is adapted for treatment with suitable colours or dyes preferably with aniline dyes. v

f 2. Fine fibroas peat.

When dealing with fine fibrous peat the process described above is also followed except that, as the fine fibrous peat will not withstand so well-the treatmentwitli caustic soda, Inse soda crystals-or washing soda in from 1% to 10% aqueous solution, the strength depending on the fineness of the peat, the finer the peat the weaker the solution.

The treatment of the fine fibrous peat is otherwise exactly as has just been described.

3. Bleaching.

is well stirred, left for abouthalf an hour and well washed with cold water until perfectly neutral. If it is found that the whiteness of the product is not quite satisfactory,

a fresh bleach is then necessary, but care should be taken that the total time taken for this second bleach should not exceed 30 minutes, this second bleaching treatment being carried out exactly as the first one.

The pulp is then washed in a tank con structed with an outlet suitable to drain the wash water from the pulp for the purpose of cleaning the pulp of all black and brown out on the bog-land itself, thereby saving cartage and labour, and it is the cheapest method of manufacturing pulp hitherto known.

What I claim and desire to secure by Letters Patent is 1. A process for the manufacture, from freshly dug peat, of pulp adapted for paper manufacture, consisting in boiling the peat with a weak aqueous solution of soda, washing the resulting pulp mass with cold water, treating the drained said mass first with an aqueous solution of bleaching powder, then with a small quantity of an aqueous solution of bicarbonate soda and stirring, acidifying said pulp mass with a very dilute solution of any acid, washing with cold water until perfectly neutral, subsequent bleaching being performed by means of a dilute aqueous solution of 2 lbs. of bleaching powder per hundredweight of pulp, to which is subsequently added a small quantity of an aqueous solution of bicarbonate of soda, washing with cold water until perfectly neutral and free from black and brown specks and pressing into cakes in a filter press substantially as described.

2. A process for the manufacture, from freshly dug peat, of pulp adapted for paper manufacture, consisting in boiling the peat with an aqueous solution of not more that 2% caustic soda, washing the resulting pulp mass with cold water, treating the drained said mass first with an aqueous solution of bleaching powder, then with a small quantity of an aqueous solution of bicarbonate of soda and stirring,

1 Aeosos acidifying said pulp mass with a very dilute solution of any acid, washing with cold water until perfectly neutral, subsequent bleaching being performed by means of a dilute aqueous solution of 2 lbs. of bleaching powder per hundredweight of pulp, to which is subsequently added a small quantity of an aqueous solution of bicarbonate of soda, washing with cold. water until perfectly neutral and free from black and brown specks and pressing into cakes in a filter press substantially as described.

3. A process for the manufacture, from freshly dug peat, of pulp adapted for paper manufacture consisting in boiling the peat with a weak aqueous solution of soda, washing the resulting pulp mass with cold water, treating the drained said mass first with an aqueous solution of bleaching powder, then with a small quantity of an aque ous solution of bicarbonate of soda and stirring, acidifying said pulp mass with a Very dilute solution of sulphuric acid, washing with cold water until perfectly neutral, subsequent bleaching being performed by means of a dilute aqueous solution of 2 lbs. of bleaching powder per hundredweight of pulp, to which is subsequently added a small quantity of an aqueous solution of bicarbonate of soda, washing with cold water until perfectly neutral and free from black and brown specks and pressing into cakes in a filter press substantially as described.

4. A process for the manufacture of freshly dug peat of pulp adapted for paper manufacture, consisting in boiling the. peat with a weak aqueous solution of soda, washing the resulting pulp mass with cold water, treating the drained said mass first with a 2% aqueous solution of bleaching powder, then with a small quantity of an aqueous solution of. bicarbonate of soda and stirring, acidifying said pulp mass with a very dilute solution of any acid, washing with cold water until perfectly neutral, subsequent bleaching being performed. by means of a dilute aqueous solution of 2 lbs. of bleach ing powder per hundredweight of pulp, to which is subsequently added a small quantity of an aqueous solution of bicarbonate of soda, washing with cold water until perfectly neutral and free from black and brown specks and pressing into cakes in a filter press substantially as described.

In testimony whereof I have signed my name to this specification.

ADOLPH LIGNEL BURLIN. 

